Zu Chongzhi 祖沖之 (
pinyin zhu3 chong1 zhi1) (
425-
500) was a
Chinese mathematician and
astronomer during the
Song Dynasty (of the
Southern Dynasties). His achievements included the
Daming calendar[?] introduced in
465 and deriving two approximations of
Pi,
3.14156 and
22/7.
